(FNAF related..who do you all think caused the bite?...Also, fandoms!)

I'm a gaint FNAF (five nights at Freddy's fan girl XD) so, I'm just curious to see some fan theories from you guys. So, who do you think caused the bite of 87?I know, a lot of people think it's Foxy, but, I don't think it's him. I think it's Mangle...well, because in the second game, Foxy was dismantled and his jaw was broken. So, why would his jaw be really broken to bite any child? I believe that Mangle's jaw is much bigger than Foxy's. So, that's my small theory.

Also: what fandoms are you guys part of?Here's mine:-Big Hero 6 (because I love Hiro lol)-FNAF-Hetalia (it's hilarious if you're an anime fan. It's a good comedy XD.)-Frozen-the Disney/non-Disney fandom-Sonic-Pokemon (not because of shipping wars, I do love the games as well. I just got my Fennikin evolved and I'm starting to play Pearl again)-Kingdom Hearts-Final Fantasy (tenth game/seventh absolute favorites)-the markiplier fan girl fandom x3